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    <h3 align="center">字母转换大小写</h3>
    <p class="text-uppercase">转换成大写：in a calm sea every man is a pilot </p>
    <p class="text-lowercase">转换成小写：IN A CALM SEA EVERY MAN IS A PILOT </p>
    <p class="text-capitalize">转换每个单词的首字母为大写：in a calm sea every man is a pilot </p>
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